Dissertation / PhD Thesis/Book

PreJuSER-56186

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Entwicklung eines Dichtungskonzepts mit elastischer Komponente für die oxidkeramische Brennstoffzelle (SOFC)

Wiener, F. (Corresponding author)FZJ*

2007
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/2553

Report No.: Juel-4244

Abstract: Solid oxide fuel cells (SOFCs) are highly efficient electrochemical energy converters. Currently, the main issues in SOFC system development are an increase the long-term stability and system efficiency. Therefore new sealing concepts for stacks are needed. The aim of this work was to develop a novel compressive composite gasket. The characteristics of leakage, thermal cyclability, and long-term chemical stability were studied at various operating conditions. An analytic model for the sealing mechanism with dependence of operating time, temperature, and normal load has been developed. The main property of the gasket is a layer of mica paper which remains elastic at SOFC operating temperatures. It is contained in a gas-tight encapsulation formed by two embossed steel sheets. For sealings between neighboring stack layers, an electrically insulating layer is still in development. To deliver the proof of concept for sealing concepts in stacks a test-bed was put into operation. The apparatus quantifies leakage fluxes within the stack and to the surroundings by mass flow measurements and mass spectroscopy. By performing ten stack tests, the proof of functionality for the test-bed was achieved, and mass balances were calculated for SOFC-stacks at any operating condition. Commercial feasibility of the composite gasket was demonstrated with an industrial partner. At manufacturing costs of £12/piece, a batch of 100 gaskets was produced in a semiautomatic process.

Note: Record converted from VDB: 12.11.2012
Note: Bochum, Univ., Diss., 2006

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEF-1)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2007

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Database coverage:

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